Process for the selective determination of oil mist or aerosols

Abstract

An automated analysis method for an impactor used as a measuring transducer for the selective determination of oil mist or aerosols. The process includes the steps of rotating the deflector plate ( 5 ) of the measuring transducer ( 1 ) about the symmetry axis thereof and of determining the quantity of oil deposited by means of an optical analyzing device from the extinction of a light beam reflected from deflector plate ( 5 ) due to the alternation between the background and the pattern produced by the micronozzles ( 4 ).

What is claimed is: 
     
       1. A process for the selective determination of a quantity of oil mist or a quantity of aerosols in a gas sample, the process comprising the steps of:
 providing a device, which has an impactor as a measuring transducer, which has micronozzles for dispensing a predetermined test gas flow and which has a deflector plate downstream of the micronozzles for depositing a non-rotationally symmetrical pattern of aerosol or oil particles on said deflector plate; 
 providing an optical analyzing device; 
 dispensing the predetermined test gas flow to deposit the non-rotationally symmetrical pattern of aerosol or oil particles on the deflector plate; 
 rotating the deflector plate relative to the optical analyzing device, about a symmetry axis of the measuring transducer; 
 determining a quantity of oil deposited by means of the optical analyzing device from an absorbence of a light beam reflected from the deflector plate due to an alternation between gray values of the background and of the pattern. 
 
     
     
       2. A process in accordance with  claim 1 , wherein the pattern is a strip pattern, a rectangle pattern, a square pattern or a triangle pattern. 
     
     
       3. A process in accordance with  claim 1 , wherein a print-mark reader is used as the optical analyzing device. 
     
     
       4. A process for the selective determination of a quantity of oil mist or a quantity of aerosols in a gas sample, the process comprising the steps of:
 providing a device, which has an impactor as a measuring transducer, which has micronozzles for dispensing a predetermined test gas flow and which has a deflector plate downstream of the micronozzles; 
 arranging the micronozzles for depositing a non-rotationally symmetrical pattern of aerosol or oil particles on the deflector plate; 
 providing an optical analyzing device with a radiation transmitter, which radiates a light beam towards said deflector plate, and a radiation receiver, which receives the reflected light beam; 
 dispensing the predetermined test gas flow to deposit the non-rotationally symmetrical pattern of aerosol or oil particles on the deflector plate; 
 moving the position of the light beam relative to the non-rotationally symmetrical pattern of aerosol or oil particles on the deflector plate; 
 determining a quantity of oil deposited by means of the optical analyzing device based on changes in the intensity of the reflected light beam from the deflector plate due to an alternation between regions of the deflector plate with the pattern of aerosol or oil particles and regions of the deflector plate without the pattern of aerosol or oil particles. 
 
     
     
       5. A process in accordance with  claim 4 , wherein the pattern is a strip pattern, a rectangle pattern, a square pattern or a triangle pattern. 
     
     
       6. A process in accordance with  claim 4 , wherein a print-mark reader is used as the optical analyzing device. 
     
     
       7. A device for the selective determination of a quantity of oil mist or a quantity of aerosols in a gas sample, the device comprising:
 an impactor as a measuring transducer, which has micronozzles for dispensing a predetermined test gas flow and which has a deflector plate downstream of the micronozzles, the micronozzles being arranged for depositing a non-rotationally symmetrical pattern of aerosol or oil particles on the deflector plate; 
 an optical analyzing device with a radiation transmitter, which radiates a light beam towards said deflector plate, and a radiation receiver, which receives the reflected light beam; and 
 a means for moving the position of the light beam relative to the non-rotationally symmetrical pattern of aerosol or oil particles on the deflector plate, wherein the optical analyzing device determines a quantity of oil deposited based on changes in an intensity of the reflected light beam, from the deflector plate, due to an alternation between regions of the deflector plate with the pattern of aerosol or oil particles and regions of the deflector plate without the pattern of aerosol or oil particles. 
 
     
     
       8. A device in accordance with  claim 7 , wherein the pattern is a strip pattern, a rectangle pattern, a square pattern or a triangle pattern. 
     
     
       9. A device in accordance with  claim 7 , wherein a print-mark reader is used as the optical analyzing device.